Question # 1

Efficiency of carnot engine is independent of the

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temperature of sink

temperature of source

nature of the working substances

none of them

If one end of a rubber cord is fixed with a support and the other end is wiggled by hand, the waves generated on the card are:

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Stationary waves

Transverse waves

Both of these

None of these

The unit of induced emf is:

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Volt

Nm/As

Joule coul^-1

Both A and C

All of these

If the value of galvanometer constant k = C/BAN is made small, the galvanometer can be made

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Sensitive

Accurate

Stable

None of these

The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be

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500 m

500 nm

500 km

500 cm

None of these

An electric charge at rest is

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Only an electric field

Only a magnetic field

Both electric and magnetic fields

None of the above

In the equation E=mc²value of c is:

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1,86,000 miles per hour

1,86,000 miles per sec

3 X 10⁸m/sec

Both A and C

Both B and C

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

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1890

1895

1900

1905

Improper biasing of a transistor circuit produces

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Heavy loading of emitter current

Distortion in the output signal

Excessive heat at collector terminal

Faulty location of load line

A ray passing through optical center of a lens, after refraction:

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Passes through focus

Go deviated

Retraces its path

Both B and C

In a transistor, if the central region is p-type then this type of transistor is known as

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p-n-p transistor

n-p-n transistor

either of these

none of these

As isolated system in which

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No internal force acts

No external force acts

No internal and external force acts

None of these

The time of flight of a projectile motion equals to

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half of the time to reach maximum height

twice the time to reach maximum height

one fourth of time to reach maximum height

time to reach maximum height

Of the following quantities, the one that is vector in character is an electric

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Charge

Field

Energy

Potential Difference

No practical heat engine can be pergectly

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Ideal

Reversible

Irreversible

None of these

No body begins to move or comes to rest of itself said by

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Thomos Young

Abu Ali Sena

Newton

None of these

The unit of work function is

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eV

Volt

Farad

Herdz

Young's modulus for concrete is

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10

15

25

30

The unit of power of a lens is

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Meter

Watt

Horsepower

Dioptre

For a system to transmit thousands of telephones conversations, several television programs and numerous data signals, it need the following number so threads of optical fibre

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100 to 200

1000 to 10000

100 to 1000

1 or 2

The product of force and time is called

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Momentum

Force

Impulse

None of these

A ballistic missile moves under the result of the superposition of

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one independent motion

two independent motions

one dependent motion

two dependent motions

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